/* wf_log10.c -- float version of w_log10.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

/*
 * wrapper log10f(X)
 */

#include "fdlibm.h"
#include <errno.h>

#ifdef __STDC__
    float log10f(float x)       /* wrapper log10f */
#else
    float log10f(x)         /* wrapper log10f */
    float x;
#endif
{
#ifdef _IEEE_LIBM
    return __ieee754_log10f(x);
#else
    float z;
    struct exception exc;
    z = __ieee754_log10f(x);
    if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
    if(x<=(float)0.0) {
#ifndef HUGE_VAL
#define HUGE_VAL inf
        double inf = 0.0;

        SET_HIGH_WORD(inf,0x7ff00000);  /* set inf to infinite */
#endif
        exc.name = "log10f";
        exc.err = 0;
        exc.arg1 = exc.arg2 = (double)x;
        if (_LIB_VERSION == _SVID_)
               exc.retval = -HUGE;
        else
           exc.retval = -HUGE_VAL;
        if(x==(float)0.0) {
            /* log10f(0) */
            exc.type = SING;
            if (_LIB_VERSION == _POSIX_)
               Djy_SaveLastError(ERANGE);
            else if (!matherr(&exc)) {
               Djy_SaveLastError(ERANGE);
            }
        } else {
            /* log10f(x<0) */
            exc.type = DOMAIN;
            if (_LIB_VERSION == _POSIX_)
               Djy_SaveLastError(EDOM);
            else if (!matherr(&exc)) {
               Djy_SaveLastError(EDOM);
            }
                exc.retval = nan("");
            }
        if (exc.err != 0)
               Djy_SaveLastError(exc.err);
            return (float)exc.retval;
    } else
        return z;
#endif
}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__
    double log10(double x)
#else
    double log10(x)
    double x;
#endif
{
    return (double) log10f((float) x);
}

#endif /* defined(_DOUBLE_IS_32BITS) */
